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Page Title:
Table 84. Hypsography line feature table (HYLINE.LFT). |
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|  MIL-D-89009
APPENDIX
TABLE 84. Hypsography line feature table (HYLINE.LFT).
{Header length};\
Hypsographic Contours;HYLINE.DOC;\
ID=
I,1,P,Row Identifier,-,-,:\
HYLNVAL= I,1,N,Elevation value,INT.VDT,-,:\
HYLNTYPE=I,1,N,Type of Contour,INT.VDT,-,:\
TILE_ID= S,1,F,Tile Reference Identifier,-,HYLINE.LTI,:\
EDG_ID= I,1,F,Edge Primitive Foreign Key,-,-,:;
1
4000
1
244
1
2
6000
1
234
2
:
:
:
:
:
n
n
n
n
n
HYLNVAL
The value attribute contains the elevation value of the contour line in
feet above MSL, as exists for the ONC charts (403.5). The code 99999 is
used to indicate that no elevation value is present. The "carrying
contour" will be assigned the highest elevation value. Valid codes for
the VAL attribute range from -1,000 feet to 29,000 feet in 1,000-foot
increments.
HYLNTYPE
ONC Codes
1 = Closed land contour
403.1
403.2
2
=
Depression contour
403.4
3
=
Closed land contour, approximate
403.2
4
=
"Carrying contour", where two or
more contour lines with different
elevation values coalesce
5
=
Depression contour, approximate
8
=
Connector. This one-digit code is used to indicate that the
segment is an arbitrary connector of the contour network. It
appears where there are discontinuities in areas or lines. This
code does not apply to gaps due to elevation value labels. This
connection was added as an enhancement to the database to
establish a network coverage so that elevation ranges represent
complete areas that can be shaded.
9
=
None (outer boundary)
Notes
ONC cut and fill features have been captured as "carrying contour". The
TYPE code 4 is used to represent the ONC feature 411.2 Cut, when it
passes through more than one contour interval. This code is also used
to represent the ONC feature 411.4 Fill, when it is present through more
than one contour interval.
111
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